Fabio Graetz wrote:Thank you! But i still have problems: 1. I looked for a tutorial about repairing disk permissions and it says, that i have too use my Mac-Os-DVD while restarting. Well, since Lion works without one, i don't have it. 2. Therefore, I tried to put the files in the named directory but i coulnt replace them, because they are in use. What shell I do now? Thanks a lot! Fabio
You don't need a DVD to repair permissions, all you need to do is go into Disk utility and hit "Repair Disk permissions"
Also, if that doesn't work again, try killing the Dock, and SystemUIServer through Terminal